Introduction
A A rea
1
Mains input
1
1
2
Rectifier
3
DC bus
4
DC reactors
5
Capacitor bank
6
Inverter
7
Output to motor
8
Control circuitry
Table 1.2 Legend to Illustration 1.3
6
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VLT Refrigeration Drive Operating Instructions
Title
Functions
•
Three-phase AC mains power
supply to the frequency
converter
•
The rectifier bridge converts
the AC input to DC current to
supply inverter power
•
Intermediate DC-bus circuit
handles the DC current
•
Filter the intermediate DC
circuit voltage
•
Prove line transient protection
•
Reduce RMS current
•
Raise the power factor
reflected back to the line
•
Reduce harmonics on the AC
input
•
Stores the DC power
•
Provides ride-through
protection for short power
losses
•
Converts the DC into a
controlled PWM AC waveform
for a controlled variable
output to the motor
•
Regulated three-phase output
power to the motor
•
Input power, internal
processing, output, and motor
current are monitored to
provide efficient operation
and control
•
User interface and external
commands are monitored and
performed
•
Status output and control can
be provided
MG16J102 - VLT is a registered Danfoss trademark